I attended my first ever Notre Dame game today and was quite impressed by the phone system I did observe on campus. They have a majority of Cisco 7900 series color display telephones but possibly a few Nortel M5000 Centrex sets still installed around campus. Back in the 1980s and 1990s Notre Dame was an exclusive Nortel Centrex shop, but that ship has sailed and they are now exclusively Cisco.
The book store uses their Cisco phones to make overhead paging announcements across the store for customer promotions. They have this newer Cisco paging that gives a brief dialtone noise after you hang up from the page.